1. A soft iron rod in a coil or transformer that provides a path for and intensifies the magnetic field produced by the windings. 
   铁心包在线圈内或变压器中的柔软铁条，用于提供道路和加强由线圈曲转产生的磁场
2. economic operation of transformer 
   变压器经济运行
3. inrush current of transformer 
   变压器涌流
4. One other week and his mortal coil would be shuffled off. 
   再过一个星期他就要离开尘世了。
5. When moving one coil near that magnet, the current has just produced. 
   靠近那磁铁转动一线圈时，电流就产生了。

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